A. Il mange de la viande et boit du bon vin
B On mange de la viande et boit du bon vin
C. On a mangé de la viande et bu du bon vin
No need to explain why or why not (I've already got the "answers"--or at least the answers according to a linguist). Just a simple "I would say that, I would not say that, people other than me might say that, etc" for each would be greatly appreciated.